Press Releases

November 21, 2007

comScore Releases October U.S. Search Engine Rankings

RESTON, VA, November 21, 2007 – comScore, Inc. (NASDAQ: SCOR), a leader in measuring the digital world, today released its monthly comScore qSearch analysis of the search marketplace. Among core search engines in October 2007, Google Sites remained the top search property with more than 6.1 billion core searches conducted, representing a 58.5 percent share of the search market. October was a strong month for overall search activity, as each of the five core search engines achieved at least 5 percent growth in the number of searches conducted.

* Based on the five major search engines including partner searches and cross-channel searches. Searches for mapping, local directory, and user-generated video sites that are not on the core domain of the five search engines are not included in the core search numbers.

* Based on the five major search engines including partner searches and cross-channel searches. Searches for mapping, local directory, and user-generated video sites that are not on the core domain of the five search engines are not included in the core search numbers.

October U.S. Expanded Search Rankings

In the October 2007 analysis of the Top 50 properties worldwide where search activity is observed, Google Sites led the pack with approximately 7.5 billion searches. Yahoo! Sites ranked second with nearly 2.6 billion searches, followed by Microsoft Sites (1 billion), Time Warner Network (905 million) and Ask Network (493 million). Ask.com saw particularly strong growth, gaining nearly 23 percent in search query volume versus September, while Facebook.com entered the ranking at number 9 with 152 million searches.

To request more information on comScore qSearch 2.0, please visit http://www.comscore.com/contactcomScore, Inc. (NASDAQ: SCOR) is a global leader in measuring the digital world. This capability is based on a massive, global cross-section of more than 2 million consumers who have given comScore permission to confidentially capture their browsing and transaction behavior, including online and offline purchasing. comScore panelists also participate in survey research that captures and integrates their attitudes and intentions. Through its proprietary technology, comScore measures what matters across a broad spectrum of behavior and attitudes. comScore analysts apply this deep knowledge of customers and competitors to help clients design powerful marketing strategies and tactics that deliver superior ROI. comScore services are used by more than 800 clients, including global leaders such as AOL, Microsoft, Yahoo!, BBC, Carat, Cyworld, Deutsche Bank, France Telecom, Best Buy, The Newspaper Association of America, Financial Times, ESPN, Fox Sports, Nestlé, Starcom, Universal McCann, the United States Postal Service, Verizon, ViaMichelin, Merck and Expedia. For more information, please visit www.comscore.com